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		<title>three.js webgl - materials - bump map [Lee Perry-Smith]</title>
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		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - bump mapping without tangents<br/>
			<a href="https://casual-effects.com/data/" target="_blank" rel="noopener">Lee Perry-Smith</a> head
		</div>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.module.js",
					"three/addons/": "./jsm/"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three';

			import { GUI } from 'three/addons/libs/lil-gui.module.min.js';

			import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js';
			import { OrbitControls } from 'three/addons/controls/OrbitControls.js';

			let container, loader;

			let camera, scene, renderer, controls;

			let mesh;

			let spotLight;

			const params = {
				enableBumpMap: true
			};

			init();

			function init() {

				container = document.createElement( 'div' );
				document.body.appendChild( container );

				//

				camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 0.1, 100 );
				camera.position.z = 12;

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0x060708 );

				// LIGHTS

				scene.add( new THREE.HemisphereLight( 0x8d7c7c, 0x494966, 3 ) );

				spotLight = new THREE.SpotLight( 0xffffde, 200 );
				spotLight.position.set( 3.5, 0, 7 );
				scene.add( spotLight );

				spotLight.castShadow = true;

				spotLight.shadow.mapSize.width = 2048;
				spotLight.shadow.mapSize.height = 2048;

				spotLight.shadow.camera.near = 2;
				spotLight.shadow.camera.far = 15;

				spotLight.shadow.camera.fov = 40;

				spotLight.shadow.bias = - 0.005;

				//

				const mapHeight = new THREE.TextureLoader().load( 'models/gltf/LeePerrySmith/Infinite-Level_02_Disp_NoSmoothUV-4096.jpg' );

				const material = new THREE.MeshPhongMaterial( {
					color: 0x9c6e49,
					specular: 0x666666,
					shininess: 25,
					bumpMap: mapHeight,
					bumpScale: 10
				} );

				loader = new GLTFLoader();
				loader.load( 'models/gltf/LeePerrySmith/LeePerrySmith.glb', function ( gltf ) {

					createScene( gltf.scene.children[ 0 ].geometry, 1, material );

				} );

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.setAnimationLoop( animate );
				container.appendChild( renderer.domElement );

				renderer.shadowMap.enabled = true;

				// EVENTS

				window.addEventListener( 'resize', onWindowResize );

				// GUI

				const gui = new GUI();

				gui.add( params, 'enableBumpMap' ).name( 'enable bump map' ).onChange( ( value ) => {

					mesh.material.bumpMap = ( value === true ) ? mapHeight : null;
					mesh.material.needsUpdate = true;

				} );
				gui.add( material, 'bumpScale', 0, 40 ).name( 'bump scale' );
				gui.open();

				// CONTROLS

				controls = new OrbitControls( camera, renderer.domElement );
				controls.minDistance = 8;
				controls.maxDistance = 50;
				controls.enablePan = false;
				controls.enableDamping = true;

			}

			function createScene( geometry, scale, material ) {

				mesh = new THREE.Mesh( geometry, material );

				mesh.position.y = - 0.5;
				mesh.scale.set( scale, scale, scale );

				mesh.castShadow = true;
				mesh.receiveShadow = true;

				scene.add( mesh );

			}

			//

			function onWindowResize() {

				renderer.setSize( window.innerWidth, window.innerHeight );

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

			}

			//

			function animate() {

				controls.update();

				renderer.render( scene, camera );

			}

		</script>

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